Hi. Many users would never know what keys or functions can do things. So I would suggest an Info Window opens on Start of the VR, to explain these functions and also a ? top right so that Info Window can be reopened at anytime.. I would also suggest that there be an option to add other information about the VR.. Like Text and Images showing or providing clues as to what they might find..

In my case, a Treasure Map with some clues as to what they might find on or around the Treasure Island.